Magnetic structure of spin orbit coupled transition metal chainsin Ca4RhO6 and Sr4IrO6
It is difficult to predict the ground states of 5d transition metal oxide, as their electrons may be strongly correlated, sensitive to the surrounding crystal field symmetry and their spin- and orbital angular momentum strongly coupled. We propose to study two new compounds from this family, which combine this complex situation with low dimensionality. We have synthesised two isostructural and isoelectronic compounds Ca4IrO6 and Sr4IrO6. Their electronic ground states should represent the same electronic situation with different strengths of spin orbit coupling - which would yield an important comparison. To this end, we propose to characterise the antiferromagnetic order in our two samples (setting in at 10 and 12 K, respectively) by magnetic neutron powder diffraction. An equivalent previous proposal to D2B (#5-31-2363) had been rejected on grounds of the magnetic moment being too small. We here follow the panel's recommendation to re-submit to D20. We expect a magnetic moment of 0.3 to 0.5 Bohr magnetons, which should yield an appreciable signal on D20.
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Marein C. Rahn; BOOTHROYD Andrew Timothy; GUO Yanfeng; Thomas C. Hansen and PRINCEP Andrew. (2015). Magnetic structure of spin orbit coupled transition metal chainsin Ca4RhO6 and Sr4IrO6. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2431